Nonlinear dynamics of trions under strong optical excitation in monolayer MoSe2

Abstract By employing ultrafast transient reflection measurements based on two-color pump-probe spectroscopy, the population and valley polarization dynamics of trions in monolayer MoSe2 were investigated at relatively high excitation densities under near-resonant excitation. Both the nonlinear dyna...

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Autores principales:	Jialiang Ye, Tengfei Yan, Binghui Niu, Ying Li, Xinhui Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b30540f1494048e99356f66f83cdfe9f
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spelling	oai:doaj.org-article:b30540f1494048e99356f66f83cdfe9f2021-12-02T15:08:03ZNonlinear dynamics of trions under strong optical excitation in monolayer MoSe210.1038/s41598-018-20810-62045-2322https://doaj.org/article/b30540f1494048e99356f66f83cdfe9f2018-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-20810-6https://doaj.org/toc/2045-2322Abstract By employing ultrafast transient reflection measurements based on two-color pump-probe spectroscopy, the population and valley polarization dynamics of trions in monolayer MoSe2 were investigated at relatively high excitation densities under near-resonant excitation. Both the nonlinear dynamic photobleaching of the trion resonance and the redshift of the exciton resonance were found to be responsible for the excitation-energy- and density-dependent transient reflection change as a result of many-body interactions. Furthermore, from the polarization-resolved measurements, it was revealed that the initial fast population and polarization decay process upon strong photoexcitation observed for trions was determined by trion formation, transient phase-space filling and the short valley lifetime of excitons. The results provide a basic understanding of the nonlinear dynamics of population and valley depolarization of trions, as well as exciton-trion correlation in atomically thin MoSe2 and other transition metal dichalcogenide materials.Jialiang YeTengfei YanBinghui NiuYing LiXinhui ZhangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-8 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jialiang Ye Tengfei Yan Binghui Niu Ying Li Xinhui Zhang Nonlinear dynamics of trions under strong optical excitation in monolayer MoSe2
description	Abstract By employing ultrafast transient reflection measurements based on two-color pump-probe spectroscopy, the population and valley polarization dynamics of trions in monolayer MoSe2 were investigated at relatively high excitation densities under near-resonant excitation. Both the nonlinear dynamic photobleaching of the trion resonance and the redshift of the exciton resonance were found to be responsible for the excitation-energy- and density-dependent transient reflection change as a result of many-body interactions. Furthermore, from the polarization-resolved measurements, it was revealed that the initial fast population and polarization decay process upon strong photoexcitation observed for trions was determined by trion formation, transient phase-space filling and the short valley lifetime of excitons. The results provide a basic understanding of the nonlinear dynamics of population and valley depolarization of trions, as well as exciton-trion correlation in atomically thin MoSe2 and other transition metal dichalcogenide materials.
format	article
author	Jialiang Ye Tengfei Yan Binghui Niu Ying Li Xinhui Zhang
author_facet	Jialiang Ye Tengfei Yan Binghui Niu Ying Li Xinhui Zhang
author_sort	Jialiang Ye
title	Nonlinear dynamics of trions under strong optical excitation in monolayer MoSe2
title_short	Nonlinear dynamics of trions under strong optical excitation in monolayer MoSe2
title_full	Nonlinear dynamics of trions under strong optical excitation in monolayer MoSe2
title_fullStr	Nonlinear dynamics of trions under strong optical excitation in monolayer MoSe2
title_full_unstemmed	Nonlinear dynamics of trions under strong optical excitation in monolayer MoSe2
title_sort	nonlinear dynamics of trions under strong optical excitation in monolayer mose2
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/b30540f1494048e99356f66f83cdfe9f
work_keys_str_mv	AT jialiangye nonlineardynamicsoftrionsunderstrongopticalexcitationinmonolayermose2 AT tengfeiyan nonlineardynamicsoftrionsunderstrongopticalexcitationinmonolayermose2 AT binghuiniu nonlineardynamicsoftrionsunderstrongopticalexcitationinmonolayermose2 AT yingli nonlineardynamicsoftrionsunderstrongopticalexcitationinmonolayermose2 AT xinhuizhang nonlineardynamicsoftrionsunderstrongopticalexcitationinmonolayermose2
_version_	1718388273965957120

Nonlinear dynamics of trions under strong optical excitation in monolayer MoSe2

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